20533031320 has 64 divisors (see below), whose sum is σ = 47021990400. Its totient is φ = 8067196800.

The previous prime is 20533031287. The next prime is 20533031333. The reversal of 20533031320 is 2313033502.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20533031291 and 20533031300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3506395 + ... + 3512245.

It is an arithmetic number, because the mean of its divisors is an integer number (734718600).

Almost surely, 2^20533031320 is an apocalyptic number.

20533031320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 20533031320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23510995200).

20533031320 is an abundant number, since it is smaller than the sum of its proper divisors (26488959080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20533031320 is a wasteful number, since it uses less digits than its factorization.

20533031320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7408 (or 7404 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 22.

Adding to 20533031320 its reverse (2313033502), we get a palindrome (22846064822).

The spelling of 20533031320 in words is "twenty billion, five hundred thirty-three million, thirty-one thousand, three hundred twenty".